/*
  Copyright (c) 2011 Arduino.  All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "itoa.h"
#include <string.h>

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

#if 0
/* reverse:  reverse string s in place */
static void reverse(char s[])
{
    int i, j ;
    char c ;

    for (i = 0, j = strlen(s) - 1 ; i < j ; i++, j--) {
        c = s[i] ;
        s[i] = s[j] ;
        s[j] = c ;
    }
}

/* itoa:  convert n to characters in s */
extern void itoa(int n, char s[])
{
    int i, sign ;

    if ((sign = n) < 0) {  /* record sign */
        n = -n;          /* make n positive */
    }

    i = 0;
    do {
        /* generate digits in reverse order */
        s[i++] = n % 10 + '0';   /* get next digit */
    } while ((n /= 10) > 0) ;     /* delete it */

    if (sign < 0) {
        s[i++] = '-';
    }

    s[i] = '\0';

    reverse(s) ;
}

#else

extern char* itoa(int value, char* string, int radix)
{
    return ltoa(value, string, radix) ;
}

extern char* ltoa(long value, char* string, int radix)
{
    char tmp[33];
    char* tp = tmp;
    long i;
    unsigned long v;
    int sign;
    char* sp;

    if (string == NULL) {
        return 0 ;
    }

    if (radix > 36 || radix <= 1) {
        return 0 ;
    }

    sign = (radix == 10 && value < 0);
    if (sign) {
        v = -value;
    } else {
        v = (unsigned long)value;
    }

    while (v || tp == tmp) {
        i = v % radix;
        v = v / radix;
        if (i < 10) {
            *tp++ = i + '0';
        } else {
            *tp++ = i + 'a' - 10;
        }
    }

    sp = string;

    if (sign) {
        *sp++ = '-';
    }
    while (tp > tmp) {
        *sp++ = *--tp;
    }
    *sp = 0;

    return string;
}
#if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 9 || \
   (__GNUC_MINOR__ == 9 && __GNUC_PATCHLEVEL__ > 2)))
extern char* utoa(unsigned value, char* string, int radix)
#else
extern char* utoa(unsigned long value, char* string, int radix)
#endif
{
    return ultoa(value, string, radix) ;
}

extern char* ultoa(unsigned long value, char* string, int radix)
{
    char tmp[33];
    char* tp = tmp;
    long i;
    unsigned long v = value;
    char* sp;

    if (string == NULL) {
        return 0;
    }

    if (radix > 36 || radix <= 1) {
        return 0;
    }

    while (v || tp == tmp) {
        i = v % radix;
        v = v / radix;
        if (i < 10) {
            *tp++ = i + '0';
        } else {
            *tp++ = i + 'a' - 10;
        }
    }

    sp = string;


    while (tp > tmp) {
        *sp++ = *--tp;
    }
    *sp = 0;

    return string;
}
#endif /* 0 */

#ifdef __cplusplus
} // extern "C"
#endif // __cplusplus
